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ON LOAD GEARS
11KV TAP CHANGER
TYPE [A] ABS
TECHNICAL DETAILS
[A]ABS11 OLTC is air insulated, externally mounted On Load Tap Changer. This OLTC works on the principle of high speed transition resistance & is suitable for both star and delta connected dry type or oil less transformer winding with linear or change-over (coarse-fine/reverser) type tapping arrangement. It has 2 different models rated for 65 and 100Amps. (Refer tech. data for details). The OLTC follows the principle of flag cycle resulting in Bidirectional power flow The 65A tap changer may be used on star connected transformers up to 1.25MVA and on delta connected transformers up to 2MVA whereas 100A tap changer may be used up to 2MVA on star connected transformers and up to 3.3MVA on delta connected transformers. It can be used up to maximum 17 positions, when connected with a change-over switch. The compact design makes its operationally more efficient than any other tap changer in its voltage and current rating class.
The complete tap-changer is housed in a sheet metal enclosure, where the drive mechanism and the selector switch chambers are separated by a metal sheet. The fixed contacts are mounted on phase boards, over which the moving contact moves and selects the tap. The selection of tap position in all the
TECHNICAL DATA
TRated voltage : 12kVMax.Rated through current : 100AMax.Rated step voltage : 250VRated insulation level : 28kV power freq and 75kVP impulseMax.number of tapping positions : 17 with change over
Power Switch
three phases simultaneously by a selector switch. The selector switch combines the function of a tap selector and a diverter switch and has a main contact and an auxiliary contacts. The drive mechanism is coupled to the selector switch by drive shaft and series of gearsand has an energy storage device that releases energy to drive the selector switch.
MOUNTING ON TRANSFORMER
The tap changer is mounted on the transformer by taking out leads via the terminal board of the tap-changer, which is a part of OLG supply.
PROTECTIVE DEVICE
The tap-changer is protected by a smoke detector, positioned on the power switch chamber of the tap-changer.
Selector Switch (2) Drive Mechanism (3) Terminal Board (9)
CONSTRUCTION DETAILS
11KV TAP CHANGER
TYPE [A] ABS
ON LOAD GEARS432, 433, SIDCO Ambattur, Chennai - 600 098.Tel : +91-44-43935800, 4393 5811.Fax : +91-44-4393 5888
E-mail : [email protected]
TEST LEVELS
TESTINGAs per IEC 60214 and IS 8468 all type tests are successfully performed on this On-load tap-changer.
1. ALL DIMENSIONS ARE IN MM.(d) TRANSPORTATION DIMNS ARE MARKED
NOTE
NOTE:
(a) APPROX. WT. OF OLTC : - 380 KG
1.CRANK ENTRY GLAND PLATE
2.REMOVABLE CRANK HANDLE
3.PUSH BUTTON FOR RAISE AND LOWER
4.EARTHING BOSS
5.WINDOW FOR TAP NO & COUNTER
6.DOOR HANDLE
7.LIFTING LUG
8.POWER SWITCH CHAMBER
9.DRIVE MECHANISM
THUS X
1011
3
5
34
8
4
5
7
144
13
12
6
108
9 9
11
6
4
14
7 12 13
3
4
7
6
8
9
4
5
13
11
12
14
10
RATED CURRENT OLTC
ON LOAD TAPCHANGER TO I.S.8468
CHENNAI-600 098 - INDIA
CONNECTION DIAGRAM DRG. NO.
NUMBER OF SERVICE TAPPING POSITION
MOTOR VOLTAGE/FREQUENCY
CONTROL VOLTAGE/FREQUENCY
DIRECTION OF POWER FLOW.
REGD.OFFICE : 338,SIDCO ESTATE,AMBATTUR.
CLIENT REF.
TRANSFORMER RATING
RATED INSULATION LEVEL
TRANSITION RESISTANCE
RATED STEP VOLTAGE
SERIAL NUMBER
TYPE
V/50HZ
V/50HZ
KVP
V
YEAR OF MFR.
V
ATR.A
348.059.059.0
377.0
59.0
377.0
7
4
1
2
3
5
6
8
9
C
B
D
E
A
TECHNICAL DATA
Model No of Current Tap Transition Cycle Tap changer No positions rating in A arrangement Wt with oil
1 17 65 Change over Bi-directional flag 300 Kg
2 17 100 Change over Bi-directional flag 380 Kg
No of positions
17 position 100A
17 position 65A
1985 1450 996 752 940
A B C D E
1668 1200 996 752 940
www.onloadgears.com